Is it possible to change the payload in a JWT?

Question

JSON Web Token

Greetings.
A jwt access token arrived at the client, say with a username: "Akram" field.
Is it possible to change this name on the client in this token and send with another name?
Or will it not pass validation after the change?

Answer 1

If you just overwrite the name, then validation will not pass. If you overwrite the name + control hash (in fact, the entire token), then there should be no problems